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I throw a lot of both of these. For forehand rollers I throw a 166 champ firebird. It's really forgiving as far as not shooting off in the wrong direction. I learned rollers by throwing mini rollers during walkouts to the next hole. This has really helped with forehand putter rollers as well. A nice shot to have when you need it!
For a tomahawk I thow a 167 champ orc. I used to play tennis and I think the serving and overhead motions I learned have helped with the motion and understanding the release heights and speeds.

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For thumbers, the more stable you get the later the disc turns in the air. I'm guessing the same would apply for tomahawks. So if you are looking for distance I would recomend a Star or Champ Whippet X. A Firebird will work too, but I prefer the whippet because it is a slower disc and seems to turn later and more on a straight line. If you are looking at a shorter shot and need bigger right hook, start using more understable discs. Check out Brian Schweberger on youtube, he throws some of the best thumbers on tour.

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I don't think either shot requires a specific disc, you should experiment with all your discs to find out what works good for you. The two shots arent the same, and you may prefer using different discs for both of them.

I dont throw a Tomahawk alot (fingers on the rim), I prefer the Thumber (thumb on the rim).
I found that long range dirvers dont go any farther than fairway drivers do, my thumber is effective from 100-175', and so I use either a Gazelle , or an Eagle.
This is a great shot to add to your arsenal, when done correctly, the disc drops dead when it lands, no skips or rolls. A well placed thumber for me will usually end up nudging the pole. I have birdied #2 at Seatac from 50' behind the big laurel bush with this shot.

I throw a forehand roller now as my drive on #17 at Lakewood.
I have been practicing this shot, only on this hole, for a few months now.
I dont have the arm to throw up through the gap all the way to the pin, but the roller gets me in birdie range now. I throw left hand forehand, the disc hits on the side of the hill and tracks the contour , which funnels it up and around towards the pin.

I think the best disc for a forehand roller is a disc that turns over slightly more than your regular forehand driver. I try and get the disc to hit the ground at about a 60° angle, for me, LHFH, about like this \ , so it stands up and rolls foreward in a straight line.

I use a Star Monarch for this shot, even on flat ground, the Monarch is a cut roller for me, so it's more predictable.